采用dsp2812控制的逆变电源并联技术-研究

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1、哈尔滨理工大学工学硕士学位论文ResearchonInverterParallelControlTechnologybyDSP2812AbstractItisbecausethemalfunctionoccurrenceoftraditionalsingle–supplysystemmayleadtosystemparalysis,sothattheparallelredundantinverterpowersupplyhasbeenwidelyusedinmanyfields.Alsoduetotheabsen

2、ceofsignallinesbetweeneachinvertersofnocontrolinterconnectionparallelsystem,itbecomesconvenientforthedesigning,installmentandcapacityenlargementofthesystem.Meanwhile,itreducesthecurrentstressofpowerswitchingdevicesandimprovesthereliabilityandflexibilityofthes

3、ystem.Thus,ithasbecometheindustryresearchmainstreamcontemporarily.Thekeyfactorofinverter’ssuccessfulparalleloperationistosolvetheproblemwhethertheoutputvoltageiswiththesamephaseandsamefrequency.Thispaperstudiesonthisquestionwiththeoreticalanalysisandexperimen

4、talverification.Firstly,itanalyzestheoutputvoltagedifferencesinfluenceonactiveand reactivepowerundertheconditionofdifferentoutputimpedancesfromtheparallel connectionequivalentcircuitmodeloftheinverter;Discussesthecurrentretrain intendancethusmaketheoutputimpe

5、danceinductiveandatthesametimededuces thecharacteristicequationofpowerPQsagging,makesproperimprovementsand calculatsthecoefficientsandcurrentrestraininductancevalueforaftermodifiedPQ saggingcharacteristicequation;Analyzesitsfrequencycharacteristicsofequivalen

6、t outputimpedanceandtheequivalentoutputimpedanceafteraddedvirtual impedanceaccordingtoclosedlooptransferfunctionwhichisdeducedbycontrol diagramofsystem;Demonstratescirculationsunderdifferentoutputimpedances; Improvesprocessofdigitalpowercalculation;Dissectsth

7、emainaffectingfactorsfor theoutputvoltagewaveformandfinallyanalyzesthecommonfailuresofinverters. Secondly,underthesimulationofMatlab/Simulink,parallelconnection three-wayinverterasanexample,conductssimulationoftheparallelsystemunder differentparameters,simula

8、tionofwhetherthesystemhasparallelflowofvirtual-II-哈尔滨理工大学工学硕士学位论文impedanceandsimulationoftheparalleledcurrentsharingeffectswhichareconductedundertheinputofinvertermodulesandfaultymodulesr